The Bilstein B12 1999 BMW 328i Base Convertible Front and Rear Suspension Kit is a comprehensive suspension upgrade for the 1999 BMW 328i Base Convertible. This kit includes two front and two rear shock absorbers, two front and two rear springs, and four mounting hardware pieces. The shocks feature Bilstein's patented monotube design, which provides superior handling and a smoother ride. The springs are designed to lower the car's ride height, giving it a more aggressive stance and improved cornering. The mounting hardware pieces make installation easy and secure. This kit is the perfect way to improve your BMW's performance and looks.